vlib: fix vlib_buffer_copy to preserve buffer flags bit
vlib: fix vlib_buffer_copy to preserve buffer flags bit

Make vlib_buffer_copy() preserve buffer flags bit the same way as
that of vlib_buffer_clone() so both are consistent.

Type: fix

Signed-off-by: John Lo <e676165d137051a9de0d8979abbff6c5d0ccb4f0@cisco.com>
Change-Id: I6c32aa1e88724b482ce2439d82019e690311b664

FDio/vpp,FDio/vpp,FDio/vpp,vpp-dev/vpp,chrisy/vpp,vpp-dev/vpp,vpp-dev/vpp,vpp-dev/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,vpp-dev/vpp,chrisy/vpp,chrisy/vpp,vpp-dev/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,vpp-dev/vpp,FDio/vpp,FDio/vpp